The invention provides a mobile communication system, a mobile station, a call control device, and a mobile communication method that are capable of allowing an emergency call, even to which a prefix indicating how to treat the emergency call is added, to break through access control, and applying priority control to the emergency call, as in the case of a normal emergency call without the addition of the prefix. UE (100) separates acquired calling number information into a prefix and a calling number, and sends an MSC (210) an Emergency Setup which includes the prefix and an Emergency Category linked with the calling number. The MSC (210) determines how to treat the emergency call (such as to block notification of a telephone number of a calling party) based on the prefix included in the Emergency Setup, and connects the emergency call to a PSAP (400) corresponding to the Emergency Category.